When Rosie Frost was jilted on her wedding day, she didn't think life could get any worse. But six years later in the throes of the Second World War, she is unceremoniously dismissed from her dream job after they discover her illegitimate child. Thankfully, top secret war office Bletchley Park recognises Rosie's talent and recruits her to decipher their Italian naval signals. Happy to be doing her bit for the war effort, Rosie settles into her new life. But when she spots a familiar face at the Park, Rosie's world threatens to come crashing down once more. Can she put her heartbreak behind her? And will wedding bells ring out across Bletchley Park before the year is out?